[Richard L]

The E symbol such as E50, E85 i snot that different in M50 ... etc.
Using Methanol as an fuel additive or fuel supplement is perfect acceptable, just not as well known term in the general sense.

In your case, it is used as supplement to raise the limitation of the OE fuel delivery system. There are several ways you can achieving this:

- adding 5th fuel injector at the throttle.
- using a single large jet at the throttle with a methanol injection system
- using individual port injection to minimise uneven cylinder distribution from a large single jet at the throttle.

You need to consider the merits of each method. If you go for a port injection, great care must be taken to ensure risk of a partial blockage to each jet is kept to a minimum. Plenty of filtration along the delivery route.